Inductance coil



Sept. 13, 1932.

R. M. HEINTZ 1 ,876,670

INDUC'IANCE COIL Filed April 25, 1932 INVENTOR, RALPH M. HE/NT'Z.

M KW ATTORNEY Patented Sept. 13, 1932 UNITED STATES PATENT OFFICE RALPHM. HEINTZ, F PALO ALTO, CALIFORNIA, ASSIGNOR T0 I-IEINTZ KAUFMAN, LTD.,OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF NEVADA mnuc'raucn con.

Application filed April 25,

My invention relates to inductance coils used in radio frequencytransmission and reception, and more particularly to a coil whoseprincipal support is included in the electrical circuit of theinductance.

Among the objects of my invention are: To provide an inductance coil andsupport of high electrical efficiency; to provide an inductance coilwhich will carry large amounts of radio frequency power without eddycurrent losses in its supports; to provide an. inductance coil whosesupporting structure is a substantial part of the electrical circuit;and to provide an inductance coil whose supporting structure addsmaterially to its inductance.

Other objects of my invention will be apparent or will be specificallypointed out in the description forming a. part of this specification,but I do not limit myself to the embodiment of my invention hereindescribed, as various forms may be adopted within the scope of theclaims.

Referring to the drawing Figure 1 is an end view of a preferred form ofmy invention.

Figure 2 is a view largely in elevation, the plane of projection beingindicated by line 2-2 of Figure 1.

One of the main problems in mounting inductors used for high power radiocommunication, particularly those of large size and weight, has been thelosses encountered in the supporting structure. Circulating currents oflarge amounts are set up in conductive supports which not only detractfrom efficiency, but often completely change the inductancecharacteristics of the coil. Insulating supports of high dielectricstrength are often of poor mechanical strength and are subject todielectric losses.

My invention allows the use of strong metal supports for the largest ofinductors, without the usual losses. Broadly speaking it comprises aninductor having its support in the form of a split turn, whose ends arefixed to a panel. The entire split turn is included in the inductorcircuit, becoming an actual part of the field-forming structure.

A preferred embodiment of this invention 1932. Serial No. 607,295.

is shown in the drawing, and will now be discussed in detail. The endsof a split turn 1 are preferably provided with integral legs 2. Thetermini of these legs are tapped, and bolts i and nuts 5 fasten the turnsolidly to a panel or other base structure 6. The periphery of the turnhas receptacles 7 preferably formed integral with it, which receive andhold insulating bars 9.

These bars may be of any material of high dielectric strength such asbakeli'te, isolantite, or pyrex glass. While I have shown seven bars inthe drawing, the exact number is determined by the size of the turn, andthe strength of framework desired.

Two split turns are preferably provided, identical in size and shape,the insulating bars connecting them. On the framework thus formed ismounted a helix 10, preferably of edgewise wound copper ribbon. 30 Ateach end the helix is fastened to one leg of the split turn by means ofconnection bolts 12. The opposite leg of the split turn is connected towire 1a which leads to the source of power.

When the end connections of the helix are made to the split turn, thehelix wire crosses over one leg of turn 1 and connects to the other leg.By this the split turn becomes a turn of the entire inductance, acontinuation of the helix spiral, and the inductance of the split turnis added to that of the helix. When radio frequency is circulatedthrough the entire inductor there is no extraneous support material inthe field wherein eddy currents may develo}. The inductance of the coilcomplete with its support may be readily calculated, and is not madesubject to correction from field distortion and drainage loss.

Large amounts of radio frequency power have been used in inductances ofmy invention without the development of hot spots, or other eddy currentlosses, in the supports. High efliciency and economy has been obtainedin commercial practice.

I claim:

1. An inductor comprising a conductive supporting turn, an insulatingframe mounted on said turn, a conductive helix woundon said frame, saidsupporting turn forming a continuation of said helix.

2. An inductor comprising a casting in the shape of a. single turn, aninsulating framework mounted on said casting, a helix wound on saidframework, said casting :forming an end turn and support for said inductor.

8. An inductor comprising a split turn, means for fastening the ends ofsaid turn to a panel, an insulating framework mounted on said turn andsupported thereby, and a helix wound on said framework, and electricallyconnecting said split turn to said helixso that the inductance of thesplit turn is added to that of the helix.

4. An inductor comprising a split turn, means for attaching the ends ofsaid turn to a panel, receptacles on the periphery of said turn,insulating bars forming a framework held hy said receptacles, a helixwound on said framework, and means connecting said split turn to saidhelix so that the inductance of said split turn is added to that of thehelix.

5. An inductor comprising a split turn, projections on the end of saidturn, means for fastening the termini of said projections to a panel,receptacles on the periphery of said turn, insulating bars held by saidreceptacles, a helix wound on said bars, and means connecting said splitturn to said helix so that the inductance of said split turn is added tothat of the helix.

In testimony whereof, I have hereunto set my hand.

RALPH M. HEINTZ.

